Improvement in machines for boring hubs



1. EISENMANN. y Machines for Boring Hubs.

N0. 138,742, Patented May13.18l3` UNITED STATES,`

PATENT OEEIcE.l

JOHN EISENMANN, OF CHICAGO, ILLINOIS.

IMPROVEMENT IN MACHINES FOR BORING HUBS.4

Specification forming part of Letters Patent No, 138,742, dated May 13,1873-; application led February 7, 1873.

To all whom it may concern:

Be it known that I, JOHN EIsENMANN, of Chicago, in the county of Cookand State of Illinois, have invented a new and-useful Improvement inMachines for Boring Hubs, 8vo.;

and I do declare that the following is a' -al figures.

This invention relates to a machine so constructed that all the radialspoke holes or sockets in a hub may be simultaneously bored to auniformdepth at one movement of the hubcarrier and feed-ring. The inventionconsists in acruciform frame having a hub-supporting slide moving inguides at one end, and at the opposite side of the frame a driving-shaftcarrying a large friction-pulley giving motion to a series ofboring-spindles journaled in aring attached to the frame perpendicularto the plane of the driving-shaft, said spindles having also alongitudinal movement in their bearings imparted to them by a cam-ring,the whole being arranged to operate as more fully hereinafter set forth.

In the drawing, A represents a cruciform frame, in one end of which ashaft, B, is journaled in bearings a, with a driving-pulley secured toit between bearings.' At the inner --end is a friction-pulley, C, whichgives motion to a series of friction-pinions, D, on spindles E radiallyjournaled in boxes b, adj ustably se-i cured in a circular groove, c, ina ange projecting inwardly from a ring, F, secured to the frame axiallyacross the center-line of the driving-shaft. The spindles have theirpulleys feathered on them, and a spiral spring, d,

coiled around each between its back end and the pulley presses thelatter into contact with .the frictionpulley c, while at the same timethe inner edge of a flange at its periphery,

one cam being provided for each spindle. g is a handleat the top,by-which it is moved; and h h are two stops diametrically opposite eachother on its periphery, which stops coming against the frame top arrestits motion, and by adjusting them govern its throw, or oscillation.

By moving the cam -ring to the right, from the position shown in Fig. 3,the cams will force the spindles inwardly into a hub or othercylindrical object placed in the axis of the machine. springs to retractthe bits and their spindles.

As many spindles may beemployed as desired, a cam being provided toforce inwardly each one, while the depth of the holes bored by them willbe governed by the throw of the cam-ring.

In guides t t' in the frame, opposite the driving-shaft, slides a rest,H, with an arm or other chuck, for holding the hub Vor object to bebored in the axis ofthe driving-shaft.

What I claim as my invention, and desire to secure by Letters Patent,is-

l. The cam-ring G provided with the cams f for moving inwardly thespindles E, as

show-n. l Y

2. The construction and arrangement of the frame A, driving-shaft B,friction gear C,

pulleys D, spindles E, springs d, ring F, cam' ring G, cams f, and stopsh, substantially as and for the purpose set' forth.

' JOHN EISENMANN.

Witnesses:

WM. H. LoTz, GEO. FERRIS.

A reverse movement allows the

